Description : In modulation technique, which of the following is referred to audible pitch? A. Width B. Frequency C. Harmonic D. Amplitude
Last Answer : B. Frequency
Description : A method of expressing the amplitude of complex non-periodic signals such as speech. A. Frequency B. Wavelength C. Volume D. Pitch
Last Answer : C. Volume
Description : How do you eliminate radio frequency variation of an oscillator transmitter caused by its supply voltage? A. Use new power supply B. Lossen power supply shielding C. Use of regulated power supply D. Use of high capacitor in the supply circuit
Last Answer : C. Use of regulated power supply
Description : What is the effect in over modulated amplitude modulated radio broadcasting transmission? A. Interference to adjacent channel B. Higher fidelity C. Increase noise D. Higher audio signal
Last Answer : A. Interference to adjacent channel
Description : Which of the following is NOT an acoustical defect to be avoided in acoustical designs? A. Reverberation B. Flutter echo C. Distortion D. Sound concentration
Last Answer : A. Reverberation
Description : When dealing with cassette decks, what does wow and flutter mean?
Last Answer : It's a pitch variation and wobble cause by voltage variations and motor deficiency, most cassette decks have a rating of .2% and wow could be heard on some taped Musical Instruments as an Oboe more pronounced.
Description : Designates the sensation of low or high in the sense of the base and treble. A. Frequency B. Intensity C. Pitch D. SPL
Last Answer : C. Pitch
Description : What is affected by the distance between the listener and the source of the sound because the intensity varies inversely with the square of the distance? A. Volume B. Pitch C. Loudness D. Frequency
Last Answer : C. Loudness
Description : In acoustics, _____ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener. A. flanking B. reverberation C. Doppler effect D. echo
Last Answer : C. Doppler effect
Description : Indicate the false statement. Noise figure is defined as A. the ratio of the S/N power supplied at the input terminal of a receiver or amplifier to the S/N power supplied to the output or ... under test, both working at the same temperature over the same bandwidth and fed from the same source
Last Answer : C. an unwanted form of energy tending to interfere with the proper and easy reception and reproduction of wanted signals
Description : What are audible sound waves? (1) Having frequency less than 20 Hz (2) Having frequency between 20 Hz to 20000 Hz (3) Having frequency more than 20000 Hz (4) None of above
Last Answer : (2) Having frequency between 20 Hz to 20000 Hz
Description : The frequency of vibration of a stretched string is _______ its length. (a) Directly proportional to (b) Inversely proportional to (c) Directly proportional to the square of (d) Independent of
Last Answer : Ans:(b)
Description : At what loudness level do pitch (in mels) and frequency (in Hz) are numerically equal? A. 0 dB B. 20 dB C. 60 dB D. 40 dB
Last Answer : D. 40 dB
Description : What significant element of sound refers to its characteristic tonal quality? A. Pitch B. Tempo C. Rhythm D. Timbre
Last Answer : D. Timbre
Description : which of the following would lower the pitch of a string instrument's sound? -General Knowledge
Last Answer : Increasing the thickness of the string used would lower the pitch of a string instrument's sound.
Description : This is referred to a product of simultaneous frequency and amplitude modulation or a carrier frequency variation which produces unwanted distortion. A. Absorption modulation B. Simultaneous modulation C. Dynamic instability D. Series modulation
Last Answer : C. Dynamic instability
Description : One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency ... capacitor in the oscillator D. Loose connections in the oscillator, amplifier, or antenna circuits.
Last Answer : D. Loose connections in the oscillator, amplifier, or antenna circuits.
Description : ____________ is the average rate of transmission of sound energy in a given direction through a cross sectional area of 1 sq.m. at right angle to the direction. A. Sound pressure B. Sound intensity C. Pressure variation D. Loudness
Last Answer : B. Sound intensity
Description : A porous material is far more efficient at high than low frequency absorption. How to improve sound absorption at lower frequencies using this absorber? A. Increase the thickness B. Decrease the thickness C. Mount with and airspace behind D. Both A and C above
Last Answer : D. Both A and C above
Description : What causes low-frequency flutter (below 1000 Hz)?
Last Answer : Rotating parts of a tape transport, such as irregular tape reels, sticking guides and pinch rollers, and capstans
Description : Determine from the following radio frequency that falls under the very high frequency band of the radio spectrum. A. 345.00 MHz B. 144.50 MHz C. 235.50 MHz D. 450.00 MHz
Last Answer : C. 235.50 MHz
Description : The extremely high frequency (EHF) band is in the radio spectrum range of _______. A. 30 to 300 kHz B. 30 to 300 GHz C. 3 to 30 MHz D. 3 to 30 GHz
Last Answer : B. 30 to 300 GHz
Description : In radio High frequency communications the higher the radio frequency the ______. A. Higher it can reach B. Shorter it can reach C. Effect is null D. Longer it can reach
Last Answer : D. Longer it can reach
Description : A radio frequency in the ultra high frequency band of the radio spectrum band. A. 235.50 MHz B. 450.50 MHz C. 150.50 GHz D. 0.31250 GHz
Last Answer : D. 0.31250 GHz
Description : Which of the following fall under the high frequency band of the radio spectrum? A. 8.2345 MHz B. 150.50 MHz C. 2.4555 MHz D. 35.535 MHz
Last Answer : A. 8.2345 MHz
Description : In cellular system, _____ defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells. A. frequency-reuse ratio B. distance-to-reuse ratio (D/R) C. reuse format plan ratio D. reuse factor
Last Answer : B. distance-to-reuse ratio (D/R)
Description : What causes high-frequency flutter (above 1000 Hz)?
Last Answer : Fixed parts of a tape transport, such as fixed tape guides and magnetic heads.
Description : One of the following is a high powered RF ac basic transmitter that has two or more stages, the oscillator stage which determines the frequency opereation and RF amplifier stage orstages that develop the ... to develop a good frequency stability. A. Goldsmith B. MOPA C. Alexanderson D. Hartley
Last Answer : B. MOPA
Description : Which of the following filters block FM radio band for TV channels (2 to 13)? A. High-pass filter B. Band reject filter C. Low-pass filter D. Band-pass filter
Last Answer : B. Band reject filter
Description : What is the high frequency sound that cannot be heard by the human ear? A. Ultrasonic B. Transonic C. Subsonic D. Supersonic
Last Answer : A. Ultrasonic
Description : Unwanted radio signal on assigned frequency. A. Splatter B. RFI C. Noise D. EMI
Last Answer : C. Noise
Description : A radio communications link is to be established via the ionosphere. The maximum virtual height of the layer is 100 km at the midpoint of the path and the critical frequency is 2 MHz. The distance between stations is 600 ... optimum working frequency? A. 6.32 MHz B. 2.1 MHz C. 5.4 MHz D. 1.8 MHz
Last Answer : C. 5.4 MHz
Description : What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave
Last Answer : D. A frequency modulated continuous wave
Description : What is the frequency range of an aircraft’s radio altimeter? A. 962 MHz to 1213 MHz B. 329.15 MHz to 335.00 MHz C. 4250 MHz to 4350 MHz D. 108.00 MHz to 117.95 MHz
Last Answer : C. 4250 MHz to 4350 MHz
Description : It is an average power of a radio transmitter supplied to the antenna transmission line taken during a long sufficient interval of time and compared with the lowest frequency encountered in the modulation ... operating conditions. A. Carrier power B. Rated power C. Mean power D. Peak envelop power
Last Answer : C. Mean power
Description : The frequency tolerance of an AM radio broadcast station A. 200 Hz B. 2000 Hz C. 20 Hz D. 2 Hz
Last Answer : C. 20 Hz
Description : Which of the following systems is not used in radio detection and ranging? A. Frequency shift B. Frequency modulation C. Pulse radar D. Amplitude modulation
Last Answer : D. Amplitude modulation
Description : Referred to as an average power from the radio transmitter supplied to the antenna transmission line taken during one radio frequency cycle under no modulation. A. Carrier power B. Rated power C. Peak envelop power D. Mean power
Last Answer : A. Carrier power
Description : Which of the following is designated as the international distress, safety and calling frequency for radio telephony for stations of the maritime mobile service when using frequencies in the authorized bands between 156 and 174 MHz? A. 165.8 MHz B. 156.8 MHz C. 158.6 MHz D. 168.5 MHz
Last Answer : B. 156.8 MHz
Description : Average power of a radio transmitter supplied to the antenna transmission line by a transmitter during one radio frequency cycle taken under the condition of no modulation. A. Peak envelop power B. Rated power C. Carrier power D. Mean power
Last Answer : C. Carrier power
Description : Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF
Last Answer : C. MF
Description : A third symbol radio emission which represent telephone transmission including sound broadcasting. A. W B. F C. C D. E
Last Answer : D. E
Description : What causes flutter in a tape recorder’s output?
Last Answer : Non-uniform tape motion caused by variations in tape speed.
Description : What is the usual response to digoxin in a patient of atrial fibrillation: A. Restoration of normal sinus rhythm B. Conversion of atrial fibrillation to atrial flutter C. Increase in ... decrease in ventricular rate D. Decrease in atrial fibrillation frequency, but increase in ventricular rate
Last Answer : C. Increase in atrial fibrillation frequency, but decrease in ventricular rate
Description : The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design is based on the principle that A Its natural frequency is very low in comparison to the frequency ... is equal to the frequency of vibration D Measurement of vibratory motion is without any reference point
Last Answer : C Its natural frequency is equal to the frequency of vibration
Description : The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design is based on the principle that a) its natural frequency is very low in comparison to the frequency ... is equal to the frequency of vibration d) measurement of vibratory motion is without any reference point
Last Answer : c) its natural frequency is equal to the frequency of vibration
Description : The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design is based on the principle that ______. (A) its natural frequency is very low in comparison to the ... is equal to the frequency of vibration (D) measurement of vibratory motion is without any reference poin
Last Answer : (C) its natural frequency is equal to the frequency of vibration
Description : The accelerometer is used as a transducer to measure earthquake in Richter scale. Its design is based on the principle that a) its natural frequency is very low in comparison to the frequency ... is equal to the frequency of vibration d) measurement of vibratory motion is without any reference poin
Description : Artificial draught produced by a fan in the furnace can be controlled by the (A) Speed of the fan (B) Damper (C) Variation in the pitch of fan blades (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Artificial draught produced by a fan can be controlled by the (A) Speed of the fan (B) Damper (C) Variation in the pitch of the fan blades (D) All (A), (B) and (C
Last Answer : (D) All (A), (B) and (C